jlledom / lwip-hurd Goto Github PK

LwIP includes a PPP module that implements PPPoE, PPPoS, PPPoL2TP, etc. Study how to make pppd work together with LwIP in order to add new interfaces and any other operation pppd need.

LwIP uses a big lock to handle concurrent access. Besides, this locking system is lightweight for embedded systems but very heavyweight for Unix systems. Introduce a more fine-grained locking system.

LwIP uses an static array to store sockets. That means allocating all the space on compile time and fix a maximum number of sockets. Change it to work with dynamic memory and no upper limit.

Right now, the entire stack is compiled with the translator and included in the binary. It would be better to create it as a separated library in order to easily update the supported version of the stack in the future.

LwIP provides a limited routing support, but it can be extended by using its routing hooks. In theory, there would be possible to add new operations to manage the routing table and call those operations from a port of the ip tool.

The stack works fine at about 600Kbps for now, but increasing the TCP receive window increases the amount of lost packets as well. The stack seems to have a hard time dealing with the TCP fast-retransmit mechanism, which eventually results in a dramatic decrease of the throughput to about 100Kbps.